docs: def terminate_ex(self, nodes, threads=False, attempts=3):
          """Wrapper method for terminate.
  
          :param   nodes: Nodes to be destroyed.
          :type    nodes: ``list``
  
          :param   attempts: The amount of attempts for retrying to terminate failed instances.
          :type    attempts: ``int``
  
          :param   threads: Whether to use the threaded approach or not.
          :type    threads: ``bool``
  
          """
          while nodes and attempts > 0:
              if threads:
                  nodes = self.terminate_with_threads(nodes)
              else:
                  nodes = self.terminate(nodes)
              if nodes:
                  logger.info("Attempt to terminate the remaining instances once more.")
                  attempts -= 1
          return nodes